我试图以编程方式从标签的底部中心到图像的顶部中心画一条线，但经过大量谷歌搜索后我无法弄清楚如何。我有一个 for 循环，它正在创建它们指向的图像和标签，因此需要编写它以适合此循环，以便它创建与其标签/图像关联的所有行并相应地定位它们。

这是循环:

    for i in 0..<hotspots.count {

        let hotspotImageButton = UIButton(type: .Custom)
        let hotspotTitleLabel = UILabel(frame: CGRect.zero)
        let hotspotTextLabel = UILabel(frame: CGRect.zero)

        hotspotImageButton.translatesAutoresizingMaskIntoConstraints = false
        hotspotTitleLabel.translatesAutoresizingMaskIntoConstraints = false
        hotspotTextLabel.translatesAutoresizingMaskIntoConstraints = false

        let whiteHotspotImage = UIImage(named: hotspots[i].image)?.imageWithRenderingMode(.AlwaysTemplate)

        hotspotImageButton.setImage(whiteHotspotImage, forState: .Normal)
        hotspotImageButton.imageView?.tintColor = UIColor.redColor()
        hotspotTitleLabel.text = hotspots[i].title
        hotspotTextLabel.text = hotspots[i].text

        hotspotTitleLabel.textColor = UIColor.whiteColor()
        hotspotTitleLabel.font = UIFont(name: "Helvetica", size: 13)
        hotspotTextLabel.textColor = UIColor.whiteColor()
        hotspotTextLabel.font = UIFont(name: "Helvetica", size: 12)


        standMapImage.addSubview(hotspotImageButton)
        standMapImage.addSubview(hotspotTitleLabel)
        standMapImage.addSubview(hotspotTextLabel)

        hotspotImageButton.snp_makeConstraints { make in
            make.leading.equalTo(standMapImage.snp_leadingMargin).multipliedBy(hotspots[i].hotspotXCoordinate)
            make.top.equalTo(standMapImage.snp_topMargin).multipliedBy(hotspots[i].hotspotYCoordinate)
            make.width.equalTo(standMapImage.snp_width).multipliedBy(0.1)
            make.height.equalTo(hotspotImageButton.snp_width)
        }

        hotspotTitleLabel.snp_makeConstraints { make in
            make.leading.equalTo(standMapImage.snp_leadingMargin).multipliedBy(hotspots[i].titleXCoordinate)
            make.top.equalTo(standMapImage.snp_topMargin).multipliedBy(hotspots[i].titleYCoordinate)
        }

        hotspotTextLabel.snp_makeConstraints { make in
            make.centerX.equalTo(hotspotTitleLabel.snp_centerX)
            make.top.equalTo(hotspotTitleLabel.snp_bottom).inset(-4)
        }

    }

Picture of what I am trying to achieve 任何帮助都会很棒，因为我对这一切还很陌生，而谷歌并没有为我提供太多帮助。

提前感谢您的帮助。

最佳答案

试试这个……!

-(void)createLineFrom:(UILabel *)base andTo:(UIImageView*)view{

    CGPoint basePoint = CGPointMake(base.bounds.origin.x+base.bounds.size.width/2,base.bounds.origin.y+base.bounds.size.height/2);
    CGPoint bellonPoint = CGPointMake((view.frame.origin.x+view.frame.size.width/2),view.frame.origin.y+view.frame.size.height);
    UIBezierPath *path = [UIBezierPath bezierPath];
    [path moveToPoint:basePoint];
    [path addLineToPoint:bellonPoint];

    CAShapeLayer *shapeLayer = [CAShapeLayer layer];
    shapeLayer.path = [path CGPath];
    shapeLayer.strokeColor = [UIColor redColor].CGColor;
    shapeLayer.lineWidth = 2;
    shapeLayer.fillColor = [[UIColor redColor] CGColor];
    [self.layer addSublayer:shapeLayer];
    }

关于ios - 从 UILabel 到 UIImage 画一条线，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/39165593/